To create lines from existing points using the 3D Viewer or Point Table, use the Line tool as with photographs and just click on the points visible in either type of window. You can draw lines between points in one type of window or between window types. I.e.. start the line drawing in a photograph, continue with point in a Point Table and then finish on a 3D Viewer.
Note: Line drawing is a continuous mode that keeps on adding line segments for every point you click on. In a photograph you get out of this mode by either hitting right mouse (and picking End Draw from the menu) , by hitting ESC key or by going into a different mode. In the 3D Viewer and the Point Table, the right mouse button option is not available. So to stop drawing lines and to start a new set of lines, press the ESC key.